Starship Gallery - Various Starfleet Vessels
Note Renderings labeled "Enterprise-J" on various websites are actually of a different ship with the same saucer and a triangular secondary hull. This design (depicted in the Ships of the Line) is non-canon.
Wolf 359 - Overview - the list of ship names, a collection of screen caps and the status of identification
Daedalus Class Problems - about its canon status, the design, the size and other issues
Size of the Oberth Class - reasons why 120m is probably too small
Analysis of the Qualor II Surplus Depot - identifying the ships in TNG: "Unification"
The DS9TM Kitbashes - thorough review including photos of the actual studio models
Starship Class Inconsistencies - a compilation of some popular problems
Designing the Equinox @ The FSD